Cobalt Stearate (Steel Cord Adhesion Promoter)
CAS Number: 2457-28-5
Cobalt Stearate is the most widely used cobalt-based adhesion promoter for bonding rubber compounds to brass-plated steel cord in radial tire belt constructions. The cobalt ions catalyze the formation of cobalt sulfide and cobalt oxide bonds at the brass-rubber interface during vulcanization, creating an exceptionally strong chemical adhesion that resists heat aging, humid conditions, and dynamic fatigue in service. Cobalt stearate is available in powder and pellet form and is compatible with all sulfur-cured NR and IR tire belt compounds.
Technical Specifications
| ash (%) | ≤0.50 |
| appearance | Pink to violet powder or granules |
| moisture (%) | ≤0.30 |
| cobalt content (%) | 9.0–10.5 |
| melting point (°C) | 90–100 |
| free acid (as stearic acid, %) | ≤2.0 |
Applications
- Radial tire belt compound brass-cord adhesion
- Steel cord adhesion in tire carcass compounds
- Steel-reinforced conveyor belt rubber bonding
- Steel bead wire adhesion in tire compounds
- High-performance motorsport tire belt compounds
Key Features
- Industry-standard cobalt adhesion promoter for steel cord tires
- Chemical bond formation at brass-rubber interface during vulcanization
- Resistant to heat aging and humid deterioration of steel-rubber adhesion
- Compatible with insoluble sulfur and sulfenamide accelerator systems
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CAS Number
2457-28-5
Category
Rubber / Tire ChemicalsAvailability
In StockSample
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